This book asks a single question and follows it through every chapter. If the most important ocean current you have never heard of is faltering, how worried should we be, and what, if anything, can we do about it? The Atlantic Meridional Overturning Circulation ( AMOC ) is best understood, and not generally heard off as a loop. Warm, salty water flows northward near the surface of the Atlantic. As it reaches the far north, it cools, becomes dense, and sinks into the deep ocean. Then it flows back south, far below the surface, before slowly rising again in other parts of the world. The northbound part of the loop is the part people sometimes recognize. Along the eastern coast of the United States, it includes the Gulf Stream, the warm current that swimmers and sailors have known for centuries. The Gulf Stream is a piece of the conveyor, the visible tip of a much larger system. Thes esystems could stop and collapse...
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